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Symptoms

Consider the following scenario:

  • You install Microsoft Exchange Server 2010 Service Pack 1 (SP1) on an Exchange Server 2010 Client Access server in a mixed Exchange Server 2007 and Exchange Server 2010 environment.

  • The forms-based authentication (FBA) method is not used for the Outlook Web App (OWA) virtual directory on the Exchange Server 2010 Client Access server.

  • You configure the external authentication method for the Exchange Server 2007 OWA virtual directory to match the internal authentication method for the Exchange Server 2010 OWA virtual directory.

  • The LegacyRedirectTypevalue on the Exchange Server 2010 Client Access server is set to Silent.

  • Exchange Server 2007 mailbox users try to access their mailboxes by using the Exchange Server 2010 Client Access server.

In this scenario, a temporary redirect page is displayed that shows the following error message:

A temporary change has occurred that requires you to connect to a different server. To connect, click the button below. For security reasons, you'll be asked to enter your user name and password again.


However, you expect the following results:

  • The client is redirected from the Exchange Server 2010 Client Access server to an externally available Exchange Server 2007 Client Access server in the same active directory site.

  • Users are prompted for credentials without any intermediate redirection page.

Cause

This problem occurs because the LegacyRedirectType value is ignored if the FBA method is not used for the OWA virtual directory on the Exchange Server 2010 Client Access server.

Resolution

To resolve this issue, install the following update rollup:

2425179 Description of Update Rollup 2 for Exchange Server 2010 Service Pack 1

Workaround

To work around this issue, use the FBA method for OWA virtual directory on the Exchange Server 2010 Client Access server.

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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